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Posted to common-dev@hadoop.apache.org by Lewis John Mcgibbney <le...@gmail.com> on 2015/05/22 21:24:59 UTC
Accessing a Configuration Description
Hi Folks,
Does anyone have a solution for accessing the value of the <description>
tag below?
I cant seem to find it from within the Configuration object accessors.
<property> <name>hadoop.tmp.dir</name> <value>/tmp/hadoop-${user.name}</value>
<description>blah blah blah</description>
</property>
Thanks in advance for any help.
Lewis
--
*Lewis*
Re: Accessing a Configuration Description
Posted by Lewis John Mcgibbney <le...@gmail.com>.
ACK Chris.
https://issues.apache.org/jira/browse/HADOOP-12021
Thanks. Lets see how the conversation goes over there.
Lewis
On Fri, May 22, 2015 at 2:24 PM, Chris Nauroth <cn...@hortonworks.com>
wrote:
> I'm sorry to be the bearer of bad news. :-)
>
> It's possible there could be some push-back on the grounds of performance
> or memory footprint. It's admittedly small, but the vast majority of
> users wouldn't need programmatic access to descriptions.
>
> I do think it would be worthwhile for you to file a jira and describe the
> use case and the proposal. Then, anyone interested can participate in a
> deeper discussion of the trade-offs on that issue.
>
> --Chris Nauroth
>
>
>
>
> On 5/22/15, 1:27 PM, "Lewis John Mcgibbney" <le...@gmail.com>
> wrote:
>
> >Thanks for your reply Chris.
> >The answer is exactly what I didn't want to hear :)
> >I am using the configuration descriptions within the Nutch 2.X Web
> >Application and they are very useful for providing additional user context
> >for augmenting configuration via the interface.
> >Sigh...
> >Would this be something which would be appreciated as a patch?
> >I can easily submit one if you guys think it would be useful.
> >Thanks for your response.
> >Lewis
> >
> >On Fri, May 22, 2015 at 1:20 PM, Chris Nauroth <cn...@hortonworks.com>
> >wrote:
> >
> >> Hello Lewis,
> >>
> >> The contents of <description> elements are not parsed and held in the
> >> Configuration data structure at runtime, so there isn't any way to
> >>access
> >> them programmatically. You can of course use external tools to parse
> >>the
> >> files directly and pull out the <description>. For example, we use XSL
> >>in
> >> the project's documentation to build an HTML table of the configuration
> >> properties, including <description>.
> >>
> >>
> >>
> http://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-common/co
> >>re
> >> -default.xml
> >>
> >>
> >> --Chris Nauroth
> >>
> >>
> >>
> >>
> >> On 5/22/15, 12:24 PM, "Lewis John Mcgibbney" <lewis.mcgibbney@gmail.com
> >
> >> wrote:
> >>
> >> >Hi Folks,
> >> >Does anyone have a solution for accessing the value of the
> >><description>
> >> >tag below?
> >> >I cant seem to find it from within the Configuration object accessors.
> >> >
> >> ><property> <name>hadoop.tmp.dir</name>
> >> ><value>/tmp/hadoop-${user.name}</value>
> >> >
> >> > <description>blah blah blah</description>
> >> >
> >> > </property>
> >> >
> >> >Thanks in advance for any help.
> >> >Lewis
> >> >
> >> >--
> >> >*Lewis*
> >>
> >>
> >
> >
> >--
> >*Lewis*
>
>
--
*Lewis*
Re: Accessing a Configuration Description
Posted by Chris Nauroth <cn...@hortonworks.com>.
I'm sorry to be the bearer of bad news. :-)
It's possible there could be some push-back on the grounds of performance
or memory footprint. It's admittedly small, but the vast majority of
users wouldn't need programmatic access to descriptions.
I do think it would be worthwhile for you to file a jira and describe the
use case and the proposal. Then, anyone interested can participate in a
deeper discussion of the trade-offs on that issue.
--Chris Nauroth
On 5/22/15, 1:27 PM, "Lewis John Mcgibbney" <le...@gmail.com>
wrote:
>Thanks for your reply Chris.
>The answer is exactly what I didn't want to hear :)
>I am using the configuration descriptions within the Nutch 2.X Web
>Application and they are very useful for providing additional user context
>for augmenting configuration via the interface.
>Sigh...
>Would this be something which would be appreciated as a patch?
>I can easily submit one if you guys think it would be useful.
>Thanks for your response.
>Lewis
>
>On Fri, May 22, 2015 at 1:20 PM, Chris Nauroth <cn...@hortonworks.com>
>wrote:
>
>> Hello Lewis,
>>
>> The contents of <description> elements are not parsed and held in the
>> Configuration data structure at runtime, so there isn't any way to
>>access
>> them programmatically. You can of course use external tools to parse
>>the
>> files directly and pull out the <description>. For example, we use XSL
>>in
>> the project's documentation to build an HTML table of the configuration
>> properties, including <description>.
>>
>>
>>http://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-common/co
>>re
>> -default.xml
>>
>>
>> --Chris Nauroth
>>
>>
>>
>>
>> On 5/22/15, 12:24 PM, "Lewis John Mcgibbney" <le...@gmail.com>
>> wrote:
>>
>> >Hi Folks,
>> >Does anyone have a solution for accessing the value of the
>><description>
>> >tag below?
>> >I cant seem to find it from within the Configuration object accessors.
>> >
>> ><property> <name>hadoop.tmp.dir</name>
>> ><value>/tmp/hadoop-${user.name}</value>
>> >
>> > <description>blah blah blah</description>
>> >
>> > </property>
>> >
>> >Thanks in advance for any help.
>> >Lewis
>> >
>> >--
>> >*Lewis*
>>
>>
>
>
>--
>*Lewis*
Re: Accessing a Configuration Description
Posted by Lewis John Mcgibbney <le...@gmail.com>.
Thanks for your reply Chris.
The answer is exactly what I didn't want to hear :)
I am using the configuration descriptions within the Nutch 2.X Web
Application and they are very useful for providing additional user context
for augmenting configuration via the interface.
Sigh...
Would this be something which would be appreciated as a patch?
I can easily submit one if you guys think it would be useful.
Thanks for your response.
Lewis
On Fri, May 22, 2015 at 1:20 PM, Chris Nauroth <cn...@hortonworks.com>
wrote:
> Hello Lewis,
>
> The contents of <description> elements are not parsed and held in the
> Configuration data structure at runtime, so there isn't any way to access
> them programmatically. You can of course use external tools to parse the
> files directly and pull out the <description>. For example, we use XSL in
> the project's documentation to build an HTML table of the configuration
> properties, including <description>.
>
> http://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-common/core
> -default.xml
>
>
> --Chris Nauroth
>
>
>
>
> On 5/22/15, 12:24 PM, "Lewis John Mcgibbney" <le...@gmail.com>
> wrote:
>
> >Hi Folks,
> >Does anyone have a solution for accessing the value of the <description>
> >tag below?
> >I cant seem to find it from within the Configuration object accessors.
> >
> ><property> <name>hadoop.tmp.dir</name>
> ><value>/tmp/hadoop-${user.name}</value>
> >
> > <description>blah blah blah</description>
> >
> > </property>
> >
> >Thanks in advance for any help.
> >Lewis
> >
> >--
> >*Lewis*
>
>
--
*Lewis*
Re: Accessing a Configuration Description
Posted by Chris Nauroth <cn...@hortonworks.com>.
Hello Lewis,
The contents of <description> elements are not parsed and held in the
Configuration data structure at runtime, so there isn't any way to access
them programmatically. You can of course use external tools to parse the
files directly and pull out the <description>. For example, we use XSL in
the project's documentation to build an HTML table of the configuration
properties, including <description>.
http://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-common/core
-default.xml
--Chris Nauroth
On 5/22/15, 12:24 PM, "Lewis John Mcgibbney" <le...@gmail.com>
wrote:
>Hi Folks,
>Does anyone have a solution for accessing the value of the <description>
>tag below?
>I cant seem to find it from within the Configuration object accessors.
>
><property> <name>hadoop.tmp.dir</name>
><value>/tmp/hadoop-${user.name}</value>
>
> <description>blah blah blah</description>
>
> </property>
>
>Thanks in advance for any help.
>Lewis
>
>--
>*Lewis*